Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm43a..05g&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SM43A-05
Other
2409 Current Systems (2721), 2721 Field-Aligned Currents And Current Systems (2409), 2790 Substorms
Scientific paper
Utilizing global auroral images obtained by Polar VIS Earth Camera we have analyzed the UV emissions from 116 classical auroral substorms. Average ground level magnetic field perturbations were deduced for 11 time steps of the substorm covering 20 min prior to the onset until well into the recovery phase. These average patterns were based on a three step normalization technique, one temporal and two spatial. Based on this study we can make the following conclusions. After the substorm onset the auroral oval becomes clearly bifurcated consisting of two components: the oval aurora in the latitude range of the pre-onset oval and expanding primarily eastward post-midnight, and the bulge aurora, which emerges out of the oval, expanding poleward and both east and west in MLT. Due to the pronounced difference in the spatiotemporal behavior of the two auroral components we suggest that their sources are quasi-independent. We suggest that in addition to the classical substorm current wedge another three dimensional wedge shaped current system is located in the inner magnetosphere post midnight. This system is not directly driven.
Gjerloev Jesper W.
Hoffman Robert A.
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